US3907460A - Vane with an axle pin for axial impeller wheels - Google Patents

Vane with an axle pin for axial impeller wheels Download PDF

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Publication number
US3907460A
US3907460A US43562774A US3907460A US 3907460 A US3907460 A US 3907460A US 43562774 A US43562774 A US 43562774A US 3907460 A US3907460 A US 3907460A
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United States
Prior art keywords
vane
axle pin
pin
threaded
screw thread
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Expired - Lifetime
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Bendt Ove Pedersen
Ole Jacobsen Bredsted
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Nordisk Ventilator Co
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Nordisk Ventilator Co
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Priority to DK34073A priority Critical patent/DK131829C/en
Application filed by Nordisk Ventilator Co filed Critical Nordisk Ventilator Co
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/26Rotors specially for elastic fluids
    • F04D29/32Rotors specially for elastic fluids for axial flow pumps
    • F04D29/34Blade mountings
    • F04D29/36Blade mountings adjustable
    • F04D29/362Blade mountings adjustable during rotation

Abstract

A vane with an axle pin for axial flow fans comprising a number of vanes, each of which being with its axle pin, connected with a screw thread to the vane root, accommodated rotatably in the hub rim of the impeller wheel. Within the hub rim the pins are connected to means for turning the total number of vanes around their axes and the axes of the associated pins during the operation of the wheel. Outside its screw thread serving for being screwed into the associated vane each pin is provided with a portion having a smaller diameter than the bottom diameter of the screw thread and inside the screw thread it is provided with a portion having a larger diameter than the outer diameter of the screw thread, the bore of the vane being designed as corresponding reamed holes inside and outside a portion having a screw thread corresponding to the screw thread of the pin. Outside the underside of the vane root a fixation ring is provided on the pin and through the vane root a fixation screw is screwed in, the end of which engages a reamed aperture in the fixation ring.

Description

United States Patent 1 Pedersen et a1.

[ VANE WITH AN AXLE PIN FOR AXIAL IMPELLER WHEELS [75] Inventors: Bendt Ove Pedersen; Ole Jacobsen Bredsted, both of Naestved, Denmark [73] Assignee: Nordisk Ventilator Co. A/S,

Naestved, Denmark 22 Filed: Jan. 22, 1974 21 App]. NO.Z 435,627

[30] Foreign Application Priority Data Jan. 22, 1973 Denmark 340/73 [52] US. Cl 416/168; 416/164 [51] Int. Cl. F04D 29/36 [58] Field of Search 416/163-168, 416/207 [56] References Cited UNITED STATES PATENTS 1,497,723 6/1924 l-Iuguenin 416/168 A X 2,054,810 9/1936 Gaba 416/165 X 2,844,303 7/1958 Kristiansen 416/164 3,085,631 4/1963 Dagrell 416/168 X I FOREIGN PATENTS OR APPLICATIONS 1,377,164 9/1964 France 416/168 1,403,498 7/1969 Germany 416/168 707,844 4/1954 UnitedKingdom 416/168 1 Sept. 23, 1975 823.526 11/1959 United Kingdom 416/168 Primary Examiner-Everette A. Powell, Jr. Attorney, Agent, or FirmSughrue, Rothwell, Mion, Zinn & Macpeak 5 7] 1 ABSTRACT A vane with an axle pin for axial flow fans comprising a number of vanes, each of which being with its axle pin, connected with a screw thread to the vane root, accommodated rotatably in the hub rim of the impeller wheel. Within the hub rim the pins are connected to means for turning the total number of vanes around their axes and the axes of the associated pins during the operation of the wheel. Outside its screw thread serving for being screwed into the associated vane each pin is provided with a portion having a smaller diameter than the bottom diameter of the screw thread and inside the screw thread it is provided with a portion having a larger diameter than the outer diameter of the screw thread, the bore of the vane being designed as corresponding reamed holes inside and outside a portion having a screw thread corresponding to the screw thread of the pin. Outside the underside of the vane root a fixation ring is provided on the pin and through the vane root a fixation screw is screwed in, the end of which engages a reamed aperture in the fixation ring.

1 Claim, 2 Drawing Figures US Patent Sept. 23,1975 Sheet 2 of2 3,907,460

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VANE WITH AN AXLE PIN FOR AXIAL IMPELLER WHEELS The invention relates to a vane with an axle pin for axial flow fans comprising a number of vanes, each of which with its pin, connected with a screw thread to the vane root, is accommodated rotatably in the hub rim of the impeller wheel and where within the hub rim the pins are connected to means for turning the total number of vanes around their axes and the axes of the associated pins during the operation of the wheel.

In such axial flow impeller wheels, particularly those having large diameters, the vanes are subjected to extremely great centrifugal forces. It may sometimes be a question of forces of up to 50 tons per vane or more.

Due to correspondingly great axial bearing pressures and the very high torque exerted on the vane during the operation, very great demands are put to the attachment of the pin in the vane. As a rule it will be out of the question to manufacture vane and pin in one piece, particularly when the vane is manufactured of cast material. Moreover it will, in particular when the fan is intended for operating in dust-containing gases which may cause a considerable wear of the vanes, be of importance that it is possible to exchange the vanes from the outside, that is to say without it being necessary to perform any operations in the interior of the hub. It is an additional requirement that the means for securing the attachment do not take up too much space, since there is only a relatively small space at disposal. Furthermore, they must not give rise to any essential weakening of the material of the vane root. 7

From British patent specification No. 627 258 an impeller wheel is known in which each vane is secured to a wheel rim by the vane root, which extends through a bore with a bearing in the wheel rim, being provided with a bore having a screw thread extending to the bottom of the bore, into which screw thread a shaft pin has been screwed, the said shaft 'pin being at its opposite end via an end piece with a bearing connected to the hub. In the case of such a construction, the screw thread in the bore of the vane foot will, besides being subjected to the centrifugal forces acting in the axial direction, also be subjected to considerable radial forces, and this makes it necessary, in particular in the case of fast-running axial flow impeller wheels having large diameters, to have the screw thread designed as a very tight-fitting thread. Such a tight-fitting screw thread will, however, besides increased costs of manu facture, also, as is mentioned in the following, cause that the screwing in of the pin is made difficult and that the risk of damage to the screw thread during this screwing-in operation is increased.

The problems mentioned above are solved in a particularly satisfactory way according to the invention by each pin outside its screw thread intended for being vane, the end of which fixation screw engages a reamed or fitting opening in the fixation ring.

The construction of the pin as fitting pins inside and outside the screw thread in connection with the corresponding reamed or fitting bores in the vane serves for absorbing radial forces, so that the screw thread is intended for absorbing only the centrifugal force directed in the axial direction. Since consequently the screw thread is not intended for absorbing the radial forces it is unnecessary to design this thread as a tight-fitting thread, and this is advantageous, since the screwing in of the pin would be made considerably more difficult and there would be a great risk of the thread seizing during the screwing-in operation so that the thread was damaged in particular the screw thread in the vane when the latter is manufactured of light-weight metal, and if the screw thread is damaged the vane has to be discarded, there being no practical possibility of boring out the thread and cutting a new thread having a larger diameter, since in this case it would be necessary to perform a corresponding boring out of all vanes and substitute all pins by pins having a heavier thread. The torsional forces occurring are during periods of standstill absorbed by the fixation screw through the fixation ring, and as this screw passes through the vane root in the axial direction, the hole in the vane root can be bored in a place where it does not cause any perceptible weakening of the material and, moreover, at such a distance from the axis that the reaction exerted by the screw against the torsion will act on a fairly large diameter so that a comparatively thin screw may be used. During the operation of the wheel, the very great centrifugal force acting on the vane in the axial direction of the pin causes that the thread is self-blocking and thereby absorbs the torsional forces.

The fixation ring may be constructed in one piece with the pin, but since it has a considerably larger diameter than the remaining part of the pin this causes a large waste of material, so that a shrinking-on of the fixation ring will be preferable.

In an embodiment of the invention the fixation ring has been shrunk onto the pin, while its aperture viewed in the direction at right angles to its plane is divided into two circular eccentrical sections, and the pin is provided with an eccentrical part corresponding to one of these sections.

Usually, a shrinking on of the fixation ring would be supposed to offer the sufficient security, but the fact that the ring is provided with two eccentrical sections and the pin with a corresponding eccentrical part offers a very considerable increase in the security against the fixation ring and the pin being turned ever so slightly relative to each other.

Below, the invention will be explained in greater detail with reference to the drawing in which screwed into the associated vane being provided with l a portion having a smaller diameter than the bottom diameter of the screw thread, and inside the screw thread being provided with a portion having a larger diameter than the outer diameter of the screw thread, and by the bore of the vane being designed as corresponding reamed or fitting holes inside and outside a portion with a screw thread corresponding to the screw thread of the pin and by a fixation ring being provided on the pin outside the underside of the vane root and by a fixation screw being screwed in through the root of the FIG. 1 diagrammatically shows part of an axial flow impeller wheel with a few vanes with the associated pins in an embodiment of the invention and FIG. 2 shows a section on line II-II in FIG. 1, a larger part of the wheel being, however, shown in this illustration.

The hub 2 of the wheel is secured on the wheel shaft 1. The hub is in this embodiment constructed in one piece with a hub disc 3 and a hub rim 4. In the hub rim a number of vanes 5 have been accommodated, each of which comprises an axle pin 6 in an axial bearing 7 secured with a nut 8 which at the same time secures an intermediate portion on the pin 6 with an adjustment arm 9 and with two balancing wings 10 which in their extreme ends are filled with lead 1 1 to achieve the necessary balancing. Each adjustment arm 9 is by means of a link rod 12 connected to an adjustment disc 13 which is axially displaceable relative to the wheel, but rotates together with the latter by means of drivers, of which FIG. 2 shows a single driver 14.

The pin 6 is secured to the vane 5 at the root 15 of the vane by means of a screw thread 16. Outside the screw thread 16 the pin 6 has a fitting portion 17 having a smaller diameter than the bottom diameter of the screw thread, and inside the screw thread it has a fitting portion 18 with a diameter larger than the outer diameter of the screw thread. These fitting portions 17 and 18 fit into corresponding parts of the bore in the vane root 15 inside and outside the screw thread 16.

These fitting portions serve for absorbing the radial forces, and for absorbing the torsional forces there has on the pin 6 been shrunk on a fixation ring 19 which cooperates with a fixation screw 20 which is screwed down through the vane root 15 with a threaded part 21 and at its end is provided with a fitting portion 22 for corresponding reamed holes in the vane root l5 and in the fixation ring 19.

As an additional safeguard against a turning of the pin 6 relative to the vane root 15 the aperture of the fixation ring 19 is, viewed in the axial direction, designed with two sections which are mutually eccentrical, while the pin 6 is provided with two corresponding portions 23 and 24 fitting these sections, the portion 23 being eccentrical relative to the axis of the pin with the same degree of eccentricity as the two sections in the aperture of the fixation ring 19.

In order to ensure that the fixation screw 20 cannot in the case of vibrations occurring work loose and thereby be flung out between the vanes, which might destroy the latter completely, the fixation screw 20 is secured in the vane root 15 by means ofa locking screw 25 which engages a turned-down groove 26 in the fixation screw 20 between the threaded part 21 and the fitting portion 22. Out of regard to the mounting this groove 26 has a length which is sufficient for in part letting the fixation screw 20 go quite clear of the fixation ring 19, in part enabling the fixation screw to be screwed down to the full depth without it being necessary to remove the locking screw 25.

In the drawing, the fitting portions 17 and 18 are shown cylindrical, but at any rate one of these portions may be designed so as to be conical.

What is claimed is:

1. In a vane mounting assembly for an axial flow fan having a plurality of vanes (5) rotatably mounted in a hub rim (4) of an impeller wheel, each vane being mounted in the hub rim by an axle pin (6) having a threaded portion (16) engaging a correspondingly threaded portion in a bore in a root portion (15) of each vane, and including means (9, 12, 13) connected to each axle pin for simultaneously rotating all of the vanes about the axes of the axle pins, the improvements characterized by:

a. a first portion (17) of the axle pin between the threaded portion and the nearest end of the axle pin having a diameter less than the inside diameter of the threaded portion,

b. a second portion (18) of the axle pin between the threaded portion and the farthest end of the axle pin having a diameter greater than the outside diameter of the threaded portion,

c. the bore in the root portion of each vane including an inner portion having a diameter generally corresponding to and for receiving said first portion of the axle pin and an outer portion having a diameter generally corresponding to and for receiving said second portion of the axle pin,

(1. a fixing ring (19) rigidly mounted on the axle pin beneath the bottom of the root portion of the vane when the axle pin is threaded thereinto, said ring extending outwardly from the axle pin and having an aperture therethrough, and

e. a locking screw (20) threaded into and extending through a bore in the root portion of the vane, an end (22) of said screw extending into the aperture in the fixing ring, whereby the first and second portions of the axle pin absorb radial forces during the operation of the fan, the threaded portion absorbs centrifugal forces, and the locking screw absorbs torsional forces.

Claims (1)

1. In a vane mounting assembly for an axial flow fan having a plurality of vanes (5) rotatably mounted in a hub rim (4) of an impeller wheel, each vane being mounted in the hub rim by an axle pin (6) having a threaded portion (16) engaging a correspondingly threaded portion in a bore in a root portion (15) of each vane, and including means (9, 12, 13) connected to each axle pin for simultaneously rotating all of the vanes about the axes of the axle pins, the improvements characterized by: a. a first portion (17) of the axle pin between the threaded portion and the nearest end of the axle pin having a diamEter less than the inside diameter of the threaded portion, b. a second portion (18) of the axle pin between the threaded portion and the farthest end of the axle pin having a diameter greater than the outside diameter of the threaded portion, c. the bore in the root portion of each vane including an inner portion having a diameter generally corresponding to and for receiving said first portion of the axle pin and an outer portion having a diameter generally corresponding to and for receiving said second portion of the axle pin, d. a fixing ring (19) rigidly mounted on the axle pin beneath the bottom of the root portion of the vane when the axle pin is threaded thereinto, said ring extending outwardly from the axle pin and having an aperture therethrough, and e. a locking screw (20) threaded into and extending through a bore in the root portion of the vane, an end (22) of said screw extending into the aperture in the fixing ring, whereby the first and second portions of the axle pin absorb radial forces during the operation of the fan, the threaded portion absorbs centrifugal forces, and the locking screw absorbs torsional forces.
US43562774 1973-01-22 1974-01-22 Vane with an axle pin for axial impeller wheels Expired - Lifetime US3907460A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DK34073A DK131829C (en) 1973-01-22 1973-01-22 Bucket with shaft to aksialbleserhjul

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US (1) US3907460A (en)
JP (1) JPS594560B2 (en)
DE (1) DE2401894C2 (en)
DK (1) DK131829C (en)
GB (1) GB1431510A (en)
SE (1) SE387718B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0153529A2 (en) * 1983-10-07 1985-09-04 Nordisk Ventilator Co. A/S A blade with a blade shaft for an impeller of an axial flow fan
US4844696A (en) * 1987-04-10 1989-07-04 Novenco A/S Blade angle control device for use in an axial flow fan the blades of which are adjustable during operation
US10473111B2 (en) 2017-10-18 2019-11-12 Rolls-Royce Corporation Variable pitch fan for a gas turbine engine

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5734480B2 (en) * 1977-06-08 1982-07-23
JPH0384862U (en) * 1989-12-20 1991-08-28
DE102007011990B4 (en) * 2007-03-09 2019-01-10 Tlt-Turbo Gmbh Device for the hydraulic adjustment of the blades of an impeller of an axial fan

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1497723A (en) * 1923-06-04 1924-06-17 Huguenin Albert Water turbine
US2054810A (en) * 1933-12-16 1936-09-22 Gaba Achille Ernest Adjustable pitch propeller
US2844303A (en) * 1952-08-27 1958-07-22 Nordisk Ventilator Axial blowers or fans
US3085631A (en) * 1958-05-29 1963-04-16 Svenska Flaektfabriken Ab Propeller fan blades

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB627258A (en) * 1946-08-27 1949-08-04 Cierva Autogiro Co Ltd Improvements in and relating to controllable pitch axial-flow fans

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1497723A (en) * 1923-06-04 1924-06-17 Huguenin Albert Water turbine
US2054810A (en) * 1933-12-16 1936-09-22 Gaba Achille Ernest Adjustable pitch propeller
US2844303A (en) * 1952-08-27 1958-07-22 Nordisk Ventilator Axial blowers or fans
US3085631A (en) * 1958-05-29 1963-04-16 Svenska Flaektfabriken Ab Propeller fan blades

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0153529A2 (en) * 1983-10-07 1985-09-04 Nordisk Ventilator Co. A/S A blade with a blade shaft for an impeller of an axial flow fan
US4573874A (en) * 1983-10-07 1986-03-04 Nordisk Ventilator Co. A/S Spring biased bayonet coupling for fan blades
EP0153529A3 (en) * 1983-10-07 1986-11-12 Nordisk Ventilator Co. A/S A blade with a blade shaft for an impeller of an axial flow fan
AU579591B2 (en) * 1983-10-07 1988-12-01 A/S Nordisk Ventilator Co. A blade with a blade shaft for an impeller of an axial flow fan
US4844696A (en) * 1987-04-10 1989-07-04 Novenco A/S Blade angle control device for use in an axial flow fan the blades of which are adjustable during operation
US10473111B2 (en) 2017-10-18 2019-11-12 Rolls-Royce Corporation Variable pitch fan for a gas turbine engine

Also Published As

Publication number Publication date
DK131829B (en) 1975-09-08
DK131829C (en) 1976-02-09
JPS49109913A (en) 1974-10-19
DE2401894C2 (en) 1982-10-21
GB1431510A (en) 1976-04-07
DE2401894A1 (en) 1974-08-01
SE387718B (en) 1976-09-13
JPS594560B2 (en) 1984-01-30

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